How do you estimate 524 divided by 9?

Answer 1

58.2222

Answer 2

There are several ways to do this. You can round 9 to 10, since it is fairly close; dividing by 10 is easy, and rounding 9 to 10 gives you an error of about 11%.

Also, you can round the first two digits of 524 to the closest multiple of 9; in that case, it is easy to divide it by 9.

In any case, it should be possible to do all these calculations mentally (that's the main point of estimating).